rustc.node4.CopyPropagation.after.mir

// MIR for `id_option`
// node_id = 4
// pass_name = CopyPropagation
// disambiguator = after

fn id_option(_1: std::option::Option<u32>) -> std::option::Option<u32> {
    let mut _0: std::option::Option<u32>; // return pointer
    scope 1 {
        let _2: std::option::Option<u32>; // "a" in scope 1 at id.rs:6:18: 6:19
        scope 2 {
            let _3: u32;                 // "x" in scope 2 at id.rs:8:14: 8:15
        }
    }
    let mut _4: u32;

    bb0: {
        StorageLive(_2);                 // scope 0 at id.rs:6:18: 6:19
        _2 = _1;                         // scope 0 at id.rs:6:18: 6:19
        switch(_2) -> [None: bb1, Some: bb2]; // scope 1 at id.rs:8:9: 8:16
    }

    bb1: {
        _0 = std::option::Option<u32>::None; // scope 1 at id.rs:9:17: 9:21
        goto -> bb3;                     // scope 1 at id.rs:7:5: 10:6
    }

    bb2: {
        nop;                             // scope 1 at id.rs:8:14: 8:15
        nop;                             // scope 1 at id.rs:8:14: 8:15
        nop;                             // scope 2 at id.rs:8:25: 8:26
        nop;                             // scope 2 at id.rs:8:25: 8:26
        _0 = _2;                         // scope 2 at id.rs:8:20: 8:27
        nop;                             // scope 2 at id.rs:8:27: 8:27
        goto -> bb3;                     // scope 1 at id.rs:7:5: 10:6
    }

    bb3: {
        nop;                             // scope 1 at id.rs:10:6: 10:6
        StorageDead(_2);                 // scope 0 at id.rs:11:2: 11:2
        return;                          // scope 1 at id.rs:11:2: 11:2
    }
}

rustc.node4.CopyPropagation.before.mir

// MIR for `id_option`
// node_id = 4
// pass_name = CopyPropagation
// disambiguator = before

fn id_option(_1: std::option::Option<u32>) -> std::option::Option<u32> {
    let mut _0: std::option::Option<u32>; // return pointer
    scope 1 {
        let _2: std::option::Option<u32>; // "a" in scope 1 at id.rs:6:18: 6:19
        scope 2 {
            let _3: u32;                 // "x" in scope 2 at id.rs:8:14: 8:15
        }
    }
    let mut _4: u32;

    bb0: {
        StorageLive(_2);                 // scope 0 at id.rs:6:18: 6:19
        _2 = _1;                         // scope 0 at id.rs:6:18: 6:19
        switch(_2) -> [None: bb1, Some: bb2]; // scope 1 at id.rs:8:9: 8:16
    }

    bb1: {
        _0 = std::option::Option<u32>::None; // scope 1 at id.rs:9:17: 9:21
        goto -> bb3;                     // scope 1 at id.rs:7:5: 10:6
    }

    bb2: {
        StorageLive(_3);                 // scope 1 at id.rs:8:14: 8:15
        _3 = ((_2 as Some).0: u32);      // scope 1 at id.rs:8:14: 8:15
        StorageLive(_4);                 // scope 2 at id.rs:8:25: 8:26
        _4 = _3;                         // scope 2 at id.rs:8:25: 8:26
        _0 = std::option::Option<u32>::Some(_4,); // scope 2 at id.rs:8:20: 8:27
        StorageDead(_4);                 // scope 2 at id.rs:8:27: 8:27
        goto -> bb3;                     // scope 1 at id.rs:7:5: 10:6
    }

    bb3: {
        StorageDead(_3);                 // scope 1 at id.rs:10:6: 10:6
        StorageDead(_2);                 // scope 0 at id.rs:11:2: 11:2
        return;                          // scope 1 at id.rs:11:2: 11:2
    }
}